121837109 has 2 divisors, whose sum is σ = 121837110. Its totient is φ = 121837108.

The previous prime is 121837087. The next prime is 121837123. The reversal of 121837109 is 901738121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83210884 + 38626225 = 9122^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 121837109 - 2²⁰ = 120788533 is a prime.

It is a super-2 number, since 2×121837109² = 29688562258955762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121837129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60918554 + 60918555.

It is an arithmetic number, because the mean of its divisors is an integer number (60918555).

Almost surely, 2^121837109 is an apocalyptic number.

It is an amenable number.

121837109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121837109 is an equidigital number, since it uses as much as digits as its factorization.

121837109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 121837109 is about 11037.9848251391. The cubic root of 121837109 is about 495.7467340478.

The spelling of 121837109 in words is "one hundred twenty-one million, eight hundred thirty-seven thousand, one hundred nine".